Important Notes
- Will not fit vehicles manufactured before 03/01/1999
- May need front drive-line modification.
- Dually applications will require different rear u-bolts
- Gas models will net more lift in the front than advertised
Features & Benefits
- 9-leaf progressive rate leaf springs.
- Steering correction for improved handling
- Levels stance and allows for up to 37" tires.
- Great ride quality on/off-road
100% Bolt-On
Zone Offroad 1999-2004 Ford Super Duty 4wd 6" Suspension System.
The newest offering for the leaf-sprung Super Duties is built around massive 9-leaf full height front leaf springs. The leaf springs thin, multi-leaf design provides a great ride while maintaining heavy-duty nature of the Super Duty. By making the springs out of 9 leafs we are able to keep the spring arch low which improves the ride. In addition, when the springs get loaded down, all of the leafs engage in a progressive nature and hold up to the added weight without sagging.
To make the steering function as well as the springs, a dropped pitman arm and track bar relocation bracket are included. Bump stop relocation brackets keep the suspension from compressing too far and Nitro shocks keep the ride smooth and controlled.
For the 2000-2004 models, the factory sway bar is retained, utilizing the factory mounts ability to be "flipped" at the frame. For 1999 models, new sway bar links are provided - which accounts for the slightly higher kit price. In the rear, full-height 5" blocks replace the factory components and add-a-leafs help get the last little bit of lift needed for a level ride stance.
Recommended Tires & Wheels
(Trimming may be required)
- 37 x 12.5 with 16 x 10 and 4 in. Backspace
Front U-Bolt Type
This vehicle was manufactured with either square front U-Bolts or radiused front U-bolts. Typically, 1999-2000 are square and 2001-2004 are radiused, but that is not always the case. The radiused U-bolts aren't square or round, but rather have a gentle radius that matches a cast factory upper U-bolt plate on top of the factory spring. Vehicles manufactured prior to 2-28-99 require yet another different box kit due to a change in the factory track bar. Please make the appropriate selection for your particular vehicle.
Shock Option
Nitro Series
- Nitrogen-charged
- Twin-tube design
- 10-stage velocity-sensitive valving
- Dual-welded ends for increased strength
- Self-lubricating seals
- Black powder coat finish
FOX 2.0 Adventure Series
- 2-inch diameter steel body
- Internal floating piston (IFP) monotube design
- Large 5/8-inch hard chrome plated heat-treated alloy steel shaft
- Race-developed high-flow piston design
- Application-specific valving to maximize performance
- Long-lasting clear anodized finish
